Quality Macbook Bags!?

Here's a classic question for you all, what bag to use to transport your Mac around? I really didn't want to post this, but I'm at my wits end with this, I need help!

I'm looking for most likely a shoulder bag for college, probably leather, something that looks good but has functionally and has enough space for 3 or 4 text books. Would be glad to hear any suggestions!?

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